Metal-bending machine.



W. VOLLMER.

METAL BENDING MACHINE.

APPLICATION 11,211 001.2,1911.

Patented D00. 2, 191

-L SHEBTS'BHEET l.

W. VOLLMER.

METAL BENDING MACHINE.

APPLlGATION FILED 0(J'l.2,191l.

Patented Dec. 2, 1913.

4 SHEETS SHEET 2.

lvi/lmwo-eo PM X W. VOLLMER.

METAL BENDING MACHINE.

APPLICATION YILED OUT. 2, 1911. 1 080,309 Patented Dec. 2, 1913.

4 SHEETS8HEET 3 Qqli/bimeo: 1 ILa I C X w W A M W. VOLLMER.

METAL BENDING MACHINE.

APPLICATION FILED 001'. z, 1011.

Patented Dec. 2, 1913.

4 SHEETS--SHEET 4.

W'ILHELMVQLLMER, 01 NEW YORK, N. Y.

I METAL-ENDING MACHINE.

To all whom it may concern.

Be it'known that I, 'WILHELM YoLLM'nn, a citizen of the United States, residing in New York, borough of Brooklyn, countyof Kings, and State of New York, have invented certain new and useful Improvements in Metal-Bending Machines, of which the following is a specification.

This invention has reference to im rovements in machines for bending meta, and more especially angle-iron, and relates particularly to machines of the general tv e shown and described in my prior Patent, 0. 811,975, issued February 6,1906.

' The objectof the invention is to provide means for better control of the metal at the bending point, whereby the bending operation. is rendered easier-and a better angle produced in the metal.

For this purpose the invention comprises abed, a guide-block on. the same, a formv ing-block on the bed, a bending-lever, and a the bending of the metal.

hammer cooperating with said parts during The invention consists further in certain other combinations of parts which,will be pointed out in the claims.

In the accompanying drawings, Figure 1 is a front elevation of my improved machine, Fig. 2 is a top-view, Fig. 3 is an endview, Fig. 1 is avertical section on line 4-4 Fig. 2, Fig. 5 is a vertical section on line -5 of Fig. 2, through thebending-lever, Fig. 6 is a plan of an angle-iron after bending, Fig. 7 is ahoi-izontal section on line 77 Fig. 1, Fig. 8 is a vertical section on line 8-8 Fig. 3, Fig. 9 is a side-elevation of a portion of the clamping-mechanism of the bending-lever, Fig. 1 is a vertical section on line l0-10 Fig.2, Fig. 11 is an'elevation of.the bcndiiig lever and guiderblock, the bed-platebeing shown in section, Fig. 12 is a h'orizo-ntalsetio'n on line 1212, Fig. 11, with additionalparts'shown, Fig. 13 is an elevation-0f amodified form of hammer, Fig. 14 is a top-view of Fig. 13, Fig. 15 is a top-view of a square'nose forming-block, and Fig. 16 shows in top-view and side-elevati-on a bendin -block adapted to be used with the machine.

Similar letters of reference ind cate cor-- responding parts.

Specification of Letters Patent.

Application filed October 2,1911.

' per wedge.

Patented Dec. 2, 1913..

Serial No. 652,388.

'The bed-plate is suitably supportedon legs or standards 11, 12, 13, 14. Between the front and rear pairs of standards extend horizontal cr0ss-bars and 16, on which is carried alongitudina-l supporting-beam 17, which supports the forming-block 20. The forming-block comprises an upper portion or head 21 (Fig. 3), a lower portion or base- 22, and a contracted web 23 connecting the head and base. A slot 24 extends longitudinally in the bed-plate, from the edge 325 of the same, and the forming-block 1S guided at itsweb 23 in said recess. A guide-block 25 is preferably cast integral with the bed plate, and the forming-block is capable of being advanced toward and withdrawn from the guide 1 block by means of a screw 26 threaded in a bracket 27 attached to t he bedplate, as shown in Figs. 2 and 3, said screw being rotatably attached at its inner end but secured against longitudinal movement relatively to the block by means of an annular groove in the screw and pins 28 in the block, engaging said groove. The outer end 29 of the screw is formed for receiving a wrench 30 or hand-wheel by which the screw may be turned.

In order to vertically adjust the forming lower wedge being y bar15 transverse of and below the bar 17, and the wedge 32 being superposed .on-

thewedge 31, in opposite direction thereto, and provided withlongitudinal slots 33 through which pass screws- 34 threaded at their lower ends in the beam 15. The screws 34' pass freely through openings inthe lower flange 35 of the beam 17, also through open-v ings in the lower wedge 31,,thereby retaining the lower wedge against longitudinal movement, and permitting the beam 17 to be raised and lowered by the inward. and outward longitjidinal movement-of the up- To the beam 15 is secured a bracket 36, and from the upwardly-extending arm of said bi'acket a threaded rod or bolt 37 extends to an upwardly-extending lug 38 of the upper wedge 32. Nuts 39 are threaded on the rod, at each side of the of said nuts forward or backward, the wedge ,lbracket-arm sud wedge-lug. By adjustment the forming-block raised or lowered so as guided and more reliably and easily moved,

" also the blows of the hammer are better resisted, and wear on the bed-plate reduced. It is obvious however that this adjustment may be omittedif desired, and the beam 17 rest directly on the beam-15, as shown in. Fig. 1..

For supporting the angle-iron being bent, the forming-block 20 is provided at its'forward portion with a pivoted laterally-swinging bending-finger l0 having at its outer end a downwardly-extending foot 4.1 bearing on the bed-plate 10, for supporting the finger at its outer end, the inner end being supported on the forming-block. A recess 42 in the forming-block is adapted to :receive the bending-finger when the same is swung inwardly.

The guide-block 25 is provided at its upper end with a removable bearing-plate 13 having a lug 4:4 in which is arranged the bearing 45 for the upper pivot 46 of the bending-lever 50, the lower pivot or gudgeon 51 of which is received in a bearing 52-01. the bed-plate 10, said bearings being on the center-line of the forming-block, but the face 53 of the bending-lever is preferably ofiset, for example, three-sixteenths of an inch, forward of the axis of the pivots, as shown in Fig. 2, so as to secure a cramping action of the parts on the metal at the point of bending. At its face the guide-block s provided with a gage-plate 54 the horizontal lower edge 55 of which is arranged above the plane of the upper surface of the formingblock, as shown in Fig. 3, and is adjustable vertically relatively to the forming-block by means of adjusting-screws 56 passing through openings in the bearing-plate 43 of the guide-block and screw-threaded at their lower part in the gage-plate. A vertical slot 58 in the gage-plate receives a screw 59, adapted to clamp by its head the gage-plate against the guide-block, and thereby lock the same in the position. to which it is adjusted. The bending-lever 50 is provided with a similar. gage-plate 60, supported by screws 61 from a lug 62 at the top of the lever, as shown in Fig. 5, and adapted to be locked by a screw 63, the head of which is received in a vertical slot 64 of the gage-plate. The gage-plates serve to retain the iron against upward movement during bending, the iron 65 being heldv between the same and the forming-block, in the manner indicated in Fig. 5.

For strengthening vthe bending-lever at its pivots, while at the same time enabling the. bending-lever andguioe-block to support the metal to the apex of the bending angle, the body of the lever is permitted to extend (Fig. 11) at top and bottom horizontally completely across the pivots or gudgeons 46, 51, but between said upper and lower extensions 201, 202 the lever is recessed as shown at 203, back to the axial line.

The bed-plate is recessed as indicated at 180, adjacent the lower bearing of the bending-lever. In this recess is adaptedto be received a reinforcing-lug'181 which is cast integral with the bending-leverand with its lower pivot. Said lug bears against the bedplate and thereby aids in pivoting the lever.

The guide-block is vertically recessed as after the bendinglever is in place a fillingblock 186 is inserted in the recess 184:, said block corresponding in form substantially to the. recess 203 in the bendingdever, and being at its face flush with theface of the guide-block (Fig. 12), thereby providing a support for the metal to be bent, approximately to the apex. of the bending-angle. The block 186 is secured by screws 187 to the guide-block.

At its outer portion the bending-lever is provided with a clamp for the iron, said clamp comprising a cam 66 having teeth 67 for engaging the metal, said cam being adapted to automatically increase its grip on the same during any backward movement of the metal on the bending-lever and there by to arrest any such movement. The cam edges 69 and slidably mounted transversely of the bending-lever in beveled ways of a depending lug 70 of the same. An upwardly-extending arm 71 ofthe bracket carries an adjusting screw 72 secured rotatably at its inner end to the bending-lever and formed at its outer end for receiving a wrench. By rotation of the screw, the bracket 68 is moved in the desired direction transversely of the bending-lever, and thereby the cam advanced toward the bendinglever for clamping thin metal, or withdrawn from the same for clamping thicker metal. The cam is operated by a shaft 73, extending downwardly through the bracket and'pro vided below the same with a handle 74, as shown in Fig. 8, retained detachably on the shaft 73 by any suitable means, as a washer 75 and springpin 76. By the handle the cam is turned into contact with the metal so as to clamp the same to the bending-lever.

For supporting the outer end of the metal while being bent, an adjustable rest is provided, comprising a standard 77 bolted to the bed-plate, and carrying :1 .-;ep 78, on the lower portion or ledge 79 of which the metal is supported, as indicated in Fig. 3. At its LIPPGI POI'lZlOII the step has a rearwardly-extending'arm 80 carrying a screw 81 engaging the standard. By turning the screw 81, the step 78 is raised or permitted to be low cred, so as to bring the same into position ,7 for properly supporting the metal. The ste standards 102 said lever 99 being returned.

is locked in the position to which it is a justed by a clamping-screw 82 extending through a vertical slot in the bracket; and screw-threaded at its inner end in the step 7 8. v

The operating mechanisnr of the bendinglever comprises a worth 85 rotatably mounted on a shaft 8-1 turning in bearings 86, 87, 88 transversely of the bedplate 10. Power is transmitted to the shaft by means of the two outer pulleys 89, 91, loose on the shaft 0 84 and an inner pulley 90 fixed thereto.- By use of two belts, one crossed and the other direct, and suitable belt-shifting mechanism (not shown, since the same may be of any ordinary type and forms no part of this invention) motion is imparted at Will in forward and in reverse direction to tight-pulley 90 and to the shaft. To the lower portion of the bendinglever is secured a rearwardly-extending toothed segment 92, engaging the worm 85. The worm is provided at one end with a clutch-member 93. The other member 94 of the clutch is splined to the shaft 84 and provided with a circumfer ential groove 95 engaged by the cl'utch pins 96 of a vertically-extending oke 97 pivoted at 98 tothe bed 10. The ore is adapted to be operated by an upward y-extending lever 99, which, passes through a slot 100 in a plate 101 supported above the. bed-plate 10 by to and normally retained in disengaged position of th clutch-members by means of a tension-spring 103 attached at one end to the handle and at the other to a hook 104 on the plate, as shown in Fig. 4.

To the. plate 101 is fulcrumed a horizontally-swinging trip lever 105 provided near one end with a hook 106-adapted to engage and retain the clutch-lever 99 in engaged po-" sition of the clutch as indicated in Fig. 2, and adapted to be disengaged; from the lever 99 for permitting the latter to disengage the clutch. At its opposite end the tripping-lever 105 is provided with an obtuselyanglcd portion 107 tangential to the arc of movement of the bending-lever, said portion formin with the lever 105 a tripping memher; In bending-lever 50 carries at its upper portion an arc-shaped support 110, to which are secured two fingers 111 and 112 respectiyely. Thefinger 112 (see Fig. 10) oonrprises a clip 114 extending at top and bottom of the support 110, transversely of the same, and bent and slotted at its for- Wardly extending portion so as to pivotally support the finger proper. At its rear wardy-extending end the clip is provided with a bolt and nut connection 115, by which.

' the rear ends of the clip are secured together the finger to be turned back by means of a a suitable handle 117 in the position shown in. dotted lines, where the finger is retained by gravity until again thrown into forward, operative position. The construction of the finger 111 is similar to finger 112, but in-.

stead of being movable along the support 110, it is secured thereto by screws, so as to be fixed, as indicated in Fig. 2.

When bending angle-iron, it is desirable to keep the horizontal flange. of the iron from buckling up or down at the point of bending. It is advantageous to employ for this purpose a hammer which shall operate on the iron at its bending point, at the time of bending. Such a hammer should operate with uniform blows at considerable speed so as to retain the heat in the metal, and render the bendingoperation easy. For this purpose I provide a hammer comprising a head made in two parts, said hammer being shaped andmoved so as to conform with the shape and movements of the bendinglever and of the forming-bloclr-finger. The head 120 of the hammer is adapted at its lower end or' face to strike the flange of the metal lying on the forming-block, so as to flatten the same against the block. The head extends upwardly beyond the guide-block 25, and is provided at its upper-portion with a screw-threaded socket adapted to receive the fastening screw 121 of a swinging hammerhead 122, which is pivoted at its lower end .123 of the swinging head 122 are during operation approximately in line with the pivot of the forming-finger, so that the head swings on the same axis therewith when both are moved by the bending-lever 50. To the upper portion of the fixed head 120 is socured by any suitable means, such as a pin 124, a yoked hammer-arm 125 which extends rearwardly and is pivoted at 126 to a standard 127 supported op the bed-plate 10. The hammer is operated by means of a t17ip-Wheel 128 loos'eon a shaft 129 supported in bearingsi1-30;r13l, 240., When the lift wheel is operated. in the direction indicated by the arrow in F i'gifl, the teeth of the same engage and release a link-132 which is piw'l oted atits upper end at 133*itdthe rear end of the hammer-lever 125, thereb} alternately raising the hammer and allowing it to fall by gravity. The link is guided at its middleportion by means of a pin 134, engaging a longitudinal slot 135 of the link. Said pin is carried at the outer end of! pair of adjustable' supportingwrods 136, 137, which are guided and supported horizontally in the standard 127 and are connected attheir inner ends by a transverse head 138 (Fig. 7).

advanced or withdrawn, and thereby the link 132- moved so that its lower end or foot" 142 is more or less in the path of ,the teeth of the trip-wheel 128. When the said foot 142 is thus advanced, the teeth of the wheel draw the link downwardly to a greater extent before releasing it, than when only a shorter portion of the foot is extended within the pathfot' the teeth, and thereby the hammer is raised to a higher point before being released.

The shock o-fthe hammer On the operating parts of the same is cushioned by means of two leather bushings 143 above and below the arm 125 between the same and the hammer-head, there being ,play' of the pin 124 in its hole in the head suflicient to permit cushioning eliect of these bushings.

Adjustment of the, hammenarm 125 vertically at its bearing is desirable,'both :t'o'r securing the proper position of the foot 142 relatively to the wheel 128, and for securing the proper angle of the face of the hammer to the forming-block. Such adjustment is accomplished by means. of upper and lower set-screws 150, 151, seated in the standard 127, and bearing respectively on the upper and lower portions of two knees 152 vertically adjustable in recesses of the standard, and carrying between them the supporting pivot 126 of the hammer-arm 125, as shown in Fig. 1. The lift-wheel is provided with clutchteeth 190, and to the shaft 129 is splined the opposite clutch-member 191, adapted to be operated by a clutch-lever 192 pivoted to the bed-plate, as shown in Fig.2, whereby the hammer may be operated at will independently of the bending-lever.

A tension-spring 153 attached at one end to the hammer-arm 125, and at the other end toa bracket-arm 154 secured to the standard 127, is placed under tension when the arm is drawn downwardly during lifting of the hammer, and when the arm. is released the spring adds itspower to the blow, thereby) increasing the e'li ectiveness of the hammer. The springmay'be readily detached from the arm 154:, and 'a spring of difi'erent strength be substituted, and thereby the strength of the blow varied, or may be omitted entirely. A spring 155 is detachably ,secured at its lower end t the guide-block 5, and at its upper end to a clip 156 adjustable longitudinally on the hammer-arm 125, said spring being placed under'tension when the arm is raised, and adding its power to the blow when the hammer de scends. By shifting the clip 156 longitudinally on the arm 125, the desired strength of the spring may be utilized. The springs 153 and 155 assist in the quick return'of the hammer from raised position, and'thereby increase the number of Hows whichit is'possible to-make during one bending operation.

The hammer may be thrown out of operation by means of a pivoted rest-piece 160 having a" handle 161, and a rounded outer end adapted to engage the hammer-arm 125 and lift the same. The rest-piece and its handle are secured to a rock-shaft 162 arranged in a bracket 163 supported on the guide-bloclnand when the handle is swung from vertical position to horizontal position as indicated in dotted lines in Fig. 1, the rest-piece 160 is raised past the center,

so that the continued downward pressure oi:

the arm 125 retains the handle 161'pressed. against a support 164 for the latter which 30 rises from the bed-plate 10. 'Thereby the rest-piece 160 is retained in place, and the hammer'in raised position, and the link 132 so far depressed that it is not engaged by the teeth of the wheel 128. I

,-The shaft 129 is shown provided with a chain-wheel 170. A fly-wheel (not shown) may be mounted on the shaft129' or on a countershaft, to reduce shock when starting and stopping the hammer. It is also obvious that any other desired means of driving the shaft can be substituted.

The operation of the machine is as follows: The forming-block having been by wrench 30 adjusted to desired position, and 1 5 the bending-lever being in open position as shown in Fig. 2, and the worm 85 at a standstill, and the hammer supported in 'raised position by its supporting-arm 160, the piece 65 of angle-iron to be bent, having previously been heated, .is placed in position with one flange horizontal on the formingblock finger, as indicated in Fig. 5, and the other flange depending below the gageplates 54 and 60. The step- 78 is adjusted to support the outer end of the iron, and the inner end is supported on the cam 66, :with the depending flange between the teeth of the cam and the face of the bending-lever. The iron having-been adjusted longitudi- 130 nally so as to make the bend at the desired point, it is clamped in position by first turning up the screw 72 so that the teeth of/the cam when retracted nearly contact with the metal. The cam 66 is then swung by means of its handle 74 so that the iron is clamped between the cam and the bending-lever. The tripping-finger 112 having been 'adjusted circuiterentially on the support 110 to the point or making a bend of the deme sired angle, the lever 99 is now moved by hand in the direction of the arrow in,Fig. 4, whereby the clutch-members 93 and 94 are engaged and the worm set in motion in such direction as to move'the bending-lever in bending direction, as indicated bv the arrow in Fig. 2. Simultaneously therewith the hammer is released by moving the handle .There now occurs the bending movement 'of the bending lever, and simultaneously therewith a series of rapid, powerful blows of' the hammer, actuated by the lift-wheel 128,

in the manner already described, these blows.

being delivered on the upper flange of the iron, at the point of bending, during the operation of bending, and preventin the buckling of the flange either up or own, and effectively hammering the flange out upon the forming-block. During the movement of the bending-lever, the swinginghead 122 of the hammer is retained in position to cooperate with the forming-finger 40, by means of a friction-spring 196, se-

cured to the fixed art 120 of the head and pressing against t e swinging head, and a tension-spring 175, secured at one end to the swinging head 122 and at the other end to the hammer-arm ,125' whereby the head is prevented from flying 0utwardly.- The swinging head 122 when the hammer is lowered contacts at its upper portion with the upper part of the bending-lever, 'whereby the hammer i during the bending operation gradually swung, in accordance with the movement of the bending finger 41 and the bending lever. The hammer assists in retaining heat in the iron being worked, and adds to the iron the heat generated by the blows of the hammer, thereby 'rendering the bending operation easy and rapid.

When the trip-finger 112, having been moved by the operation of the worm, segment and bending-lever to the tripping portion 106 of the tripping-lever, contacts therewith, it swings the same so as to release the clutch-lever 99 from the tooth 106. The spring 103 immediately moves the clutchlever so that the clutches are disengaged and the worm and bending-lever come to rest. The operation of the hammer being independent of the worm and bending-lever,

.the same may be continued if desired after the bending o eration is completed or may be discontinue at any time, before or slmultaneously therewith, by depressing the ham mer-arresting lever161, or by operating the clutch-handle '192.

By the operation described the metal is bent to t e angle for which the machine was set by adjustment of the finger 112, and is provided with a smooth, flat, somewhat rounded flange 197 at the point ofbending, as shown in F i 6. The bent metal is now released from to machine by, releasing the cam 66 b means of its handle, and then withdrawing the forming-block until the metal can be lifted. The metal having been removed, the finger 112 is thrown back, by means of its handle 117 and thus the lever 105 released. The worm is started in reverse direction by first shifting the belts on the pulleys 89, 90, 91, so' as to reverse the direction of the shaft 84, and then throwing in the clutch by moving the clutch-lever 99 from retracted to forward position where it is engaged and held by the tooth 106 of the tripping-lever, and. where at the same time it serves to hold said lever in such position that its tripping-portion 107 willbe engaged by the finger 111, on the return of the utter,

By the rotation of the worm the bending-- lever is moved in return direction. When the finger 111 strikes the tripping-lever 107 it swings the same and thereby releases the clutch-lever 99, which is returned by its spring 103 into disengaged position of the clutches, whereby the operation of the worm is-discontinued ,and the bending-lever comes to rest in original position, as indicated in Fig. 2, read to receive another piece of metal to be nt. Inasmuchvas the finger 111 normally retains the t-ripping lever 105 out of engaging position, it is necessary to raise said finger prior to again starting-the machine. Another piece of, metal havin been inserted, the finger is then raised an the clutches 94,95, thrown in, and the bending operation repeated as described. The angle of bending ma be changed for example from an angle 0 90 degrees to a larger included angle by shifting the adjustable finger-112 on its support or scale 110 to a point nearer the bending-lever, whereby the tripping action of the finger takes place at an earlier time during the bending, and the motion of the bending-lever is discontinued when the same has swung to the desired angle with the formin -block and guideblock. For decreas'ng t e included angle to which the metal is to be bent, the finger 112 is moved outwardly on its scale 110 to the desired oint so that the bending-lever is p'ermitted to be, moved to the desired extent before being thrown out of operation by the finger.

In. Figs. 11 and 12 is shown a modified form of support for the metal at the outer portion of the bending-lever. In this construction the lever is provided with two to I holes through which extend two fasteningbolts 210, 211, adapted to engage corresponding openings of a plate 212, having at its forward upper portion a horizontal pro jection 218 which is spaced at its edge from the bending-lever, as seen in Fig. 12. The metal to be'bent rests by its horizontal flange on the projection 213 and abuts at its end against the vertical 'dge'of the plate, as indicated in dotted lines. The metal being thus prevented from backward movement during the swinging of the bending-lever, is cramped and upset into the apex, whereby a sharp angle at the point 'of bending is secured. For assisting in the support of the metal a transverse lug 21 1 is provided on the plate, beneath the projection 213. The support is provided with a plurality of holes whereby the same maybe adjusted along the lever and set at the point desired. This support is of use when large quantities ofmetal are to be uniformly bent, as it provides a fixed abutment requiring no manipulation for the insertion or release of the metal.

In the modified form ofhammer shown in Figs. 13 and 1 1, the head 220 is provided at its upper end with a guiding extension or rod 221. From the guide-block 222 rises a standard 223 carrying at its upper end a head 224 connected with a cap-plate 225 by bolts 226. The hammer-rod 221 is provided with a feather 227. Above the head is a bushing 228,'rotatable in an opening in the head, and itself provided with an opening adapted to receive the hammer-rod; Above the bushing, and supported by the same, is

,a handle likewise having an opening adapted to permit the passage of the hammer-rod and engaging the same by its spline. Above the handle229 is a sleeve 230, which also is rotatable with and adapted to permit the reciprocation of the hammer-rod therein. To the hammer-rod is attached, below the head 22 1 a clip 231, having trunnions 232 engaging the yoke of the hammer-arm 233. The hammer is reciprocated vertically by the hammer-arm 233, and is guided in the bushing 228 and in the cap-plate 225, and is capable of being turned on its axis by the handle 229 during the bending operation. The hammer is preferably of angular crosssection as indicated in top-view in Fig. 14, and the apex of the same approximates the apex of the bending-angle between the forming-block, guide-block and bending-lever. The sleeve 230 prevents the handle 229 following the hammer-rod in its vertical motion. By means of this hammer, direct-yertical blows are given to the metal, and the same are by the handle capable of being rected' to the most aclvantageouspoint to prevent buckling and to weld the metal being worked.

The forming-blood: may have a. round nose as showlrat 326* an Fig. 12, or the nose.

may be square, as shown at 327 in Fig. 15. In the latter case the finger 10 is pivoted sufficiently back from the clamping edge 328 so that the recess 329 of the same does not break the edge 328, but that edge remains continuous tov the point 327. The width of the finger is such that its outer edge 330 comes flush with the corresponding edge of the block when in inward position, whereby the metal is completely supported at the close of bending.

When it is desired to bend angle iron in opposite direction to that shown in Fig. 6, the bending-block shown in Fig. 16 is placed in position between the guide-block and forming-block, with its pivot 340 on the median line of the same, in which position it is retained by a lug 341 of one of its hinged members 342, 3 13-, engaging a recess in the bed-plate 10. The iron is then placed in position with its vertical flange between the forming-block and bending-block, and.

its horizontal flange resting on the latter, and the bending takes place in the usual manner. r

It is obvious that changes may be made in the construction without departing from the head opposed to the forming-block, and a movable head opposed to the movable finger of the forming-block.

2. In a metalbending machine, the com-' bination, with a forming-block having a swinging-finger, a guide-block, and a bending-lever, of a hammer located to strike the metal held by said blocks, and having a fixed head opposed to the forming-block, and having a swinging-head opposed to the finger of the forming-block, and means for retaining the swinging head in juxtaposition to said finger during bending.

3. In a metal-bending machine, the combination, with a forming-block, a guideblock, and a bending-lever, of a hammer located to strike the metal held bysaid blocks, and-having a movable head, and means for moving said head simultaneously with the metal during bendin 4.. In a metal-bending machine, the combination, with a forming-block and a guide: block, of a bending-lever, means for moving the bending-lever, a hammer located to strike the metal held by said blocks and provided with a swinging head, means for moving said head toward the bending-lever, and means for actuating said hammer.

5, In a metal-bending machine, the combinat1on,wvitha forming-block and a guide-- block, of a bending-lever, means for moving the same, a hammer located to strike the metal held by said blocks and provided with a swinging head, means for guiding the hammer in a straight line for striking, means for swingiiig said head during the bending operation toward the bending-lever,

' and means for actuating the hammer during the bending operation.

6. In a metal-bending machine, the combination of a hedplate, a forming-block and a guide-block on the same, a hammer located to strike the metal held between said blocks and provided with a swinging head, means for actuating said hammer, a bending-lever, means for moving said swingin head toward the bending-lever during tie bending operation, means for moving the bending lever in bending direction, means for dis continuing the motion of the bending-lever at a predetermined point, means for returning the bending-lever, and means for discontinuing said ope at-ion at a predetermined point. M

7. In a metal-bending machine, the combination of a bedplate, a forming-block and a guide-block supported thereon, a bendinglever, means for moving said bending-lever over the bedplate, a hammer provided with a swinging head, means for adjusting the forming-block relatively to the hammer, means for moving said head toward the bendinglever during the bending operation, and means for actuating the hammer.

In testimony, that Lclaim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

WILHELM VOLLMER.

Witnesses JOHN MURTAGH, L. M. DORMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patentl, Washington, D. 0." 

